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Higher output is usually attained at greater RPMs, and correct internal specifications and clearances ensure longevity at higher engine speeds.
While many 350 CI engines can easily produce 400 or more horsepower, there are some internal parts that are prone to failure, such as connecting rod bolts.
Even GM's high performance castings from the late '60s and '70s do not favorably compare to the more recent factory "Vortec" heads.
These heads---produced for the late 1990's 5.7L Vortec engine---have airflow characteristics that are better than even heavily modified, early GM castings and can support over 400 horsepower with careful intake/carburetor and camshaft selection.
While a completely stock lower end (short block) can be sufficient, the factory components may not be strong enough for sustained performance at higher power levels.
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In fact, in competition configurations, this engine platform can achieve well over 1.5 horsepower per cubic inch.